Direct TPMS against Indirect TPMS

As the name implies direct TPMS gathers tyre pressure data directly from the TPMS tyre valve. Each wheel is equipped with a sensor that transmits to the car the pressure information in real time. As indicated in the name Indirect TPMS uses the ABS sensors to approximate tyre pressure, and motorists must drive a reasonable distance before this system will generate an alert.

Research in America shows that 69% of customers if given a choice express a preference for the direct TPMS system. They do not want to be responsible for manually resetting an indirect TPMS system. The problem with indirect TPMS is that once tyres have been pumped up to the correct pressure the system has to be recalibrated by the driver.

Additionally in order for indirect TPMS to work correctly all four tyres must be correctly inflated. As we all know people do not check there tyre pressures on a regular basis, if all four tyres are similarly low in pressure from neglect (a common problem) or some other reasons the indirect system will not trigger the warning light. Also if all four tyres have low pressures the tyres will wear out quicker on the edges and the car is unsafe to drive, be unstable, have less traction on wet roads, take longer to stop and also use more fuel.

Direct TPMS gets over these problems by transmitting the tyre pressure to the car in real time so a sudden loss of air is immediately highlighted. Also with most systems you can check your tyre pressures without having to attach a tyre pressure gauge to the valve so you get advanced warning if you have a problem.

So the pros and cons. Indirect is cheaper as it uses the cars existing ABS sensors, but it is not as flexible and can take time to raise the alarm. Direct TPMS costs more as you need 4 special valves (some cars also have the spare tyre covered as well) but it can indicate in real time if you have a problem and which tyre has low pressure.

Direct TPMS valves can also suffer from corrosion from road salt and the battery life is normally between five and seven years. Corroded valve stems can normally be serviced or replaced, but once the battery has gone the sensor needs to be replaced.

We can service and replace sensors on your car at your home or work so you don't even need to visit a dealer.

Call 0800 783 93 10 or 0333 444 5454 to book an appointment